On a multi-day trek, the human body becomes a furnace that needs constant feeding. A mountain hike with significant elevation gain can burn between 3,000 and 5,000 calories a day — far beyond what a standard meal can provide. Left unaddressed, this energy debt accumulates day after day and results in a fatigue that has nothing to do with muscular effort anymore: the exhaustion of the underfed hiker, often mistakenly blamed on poor fitness.
Balancing Macronutrients
Carbohydrates remain the main fuel for mountain effort — they quickly supply muscles with usable energy. Fats, denser in calories, provide endurance over time: dried fruit, peanut butter and hard cheese are precious allies on a multi-day trek. Protein, often overlooked on the trail, is nonetheless essential for overnight muscle recovery.
"You don't eat on a trek for pleasure. You eat to keep moving tomorrow."
Strategic Snacking
Rather than three large meals, favour regular snacking every hour: a handful of dried fruit, an energy bar, a few squares of dark chocolate. This approach keeps blood sugar stable and avoids the sudden energy crashes that follow heavy digestion mid-climb.
Breakfast deserves particular attention since it shapes the first hours of effort. A mix of slow carbs (oats) and fast sugars (honey, dried fruit) lets you start the day with sufficient reserves without weighing down your stomach before the ascent.
Never forget that appetite decreases with altitude and accumulated fatigue — it's precisely in these moments that you must force yourself to eat, even without hunger, to avoid the downward spiral that turns a beautiful expedition into an ordeal.